Nothing wrong with hairy armpits on a woman. Think we only shaved through masculine pressure. I might shave if I had a dress that hairs sticking over the cloth would spoil, otherwise 'no'. I used to conform when younger, then I grew up! Just keep clean is the word - have you ever nicked your armpit with a razor? Not good.
Happily, when living in France I discovered that women do not, in general, shave their armpits. Yippee!
I'd be cautious of a man who shaved anything but his chin!